Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "Kotlin's extension is usually .kt."

A block of code is set as follows:

var s = "I'm a string"
s = 1 // s is a String

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

var s = "I'm a string"
s = 1 // s is a String

Any command-line input or output is written as follows:

I would suggest: a guitar

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "One of the most common tasks for Java developers is to create another Plain Old Java Object (POJO)."

Warnings or important notes appear like this.

Tips and tricks appear like this.